lang-maid



2 Sheets-Sheet 1.

G. E. LANGMAID'. BUTTON HOLE CUTTING MACHINE.

(No Model.)

Patented Jan. 24,1882.

(N 0 Model.)

2 Sheets-Sheet 2. G. E. LANGMAID;

BUTTON HOLE CUTTING MACHINE; No. 252,781.

Patented Jan. 24, 1882.;

. WITNEEF/ZZ INVENTEI I UNITED STATES PATENT OFFICE.

CHARLES E. LANGMAll), OF MIDDLEBOROUGH, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO HORATIO BARROWS, OF SAME PLACE.

BUTTON-HOLE-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 252,781, dated January 24, 1882. Application filed October 31, 1851. (No model.)

To all whom it may concern:

Be it known that LGnAaLEs ELANGMAID, of Middleborough, in the county of Plymouth and State of Massachusetts, have invented new and useful Improvements in Button-HolcUutting Machines, of which thefollowing is aspectfication.

My invention relates to devices forstopping and starting the euttingdie of a power-ina- 1o chine, and has for its object the controlling of the movement of the die, so that but a single hole shall be cut byit at each movementof the foot-lever which starts and stops the machine. This object is attained by the mechanism illus- 1 trated in the accompanying drawings, in

which- Figure 1 is a side elevation of my machine, the driving-pulley and clutch device of which are shown in the position which they occupy when the working part of the machine is not, in operation. Fig. 2 shows in elevation a part including a clutch device, the parts of which are shown in the position that they occupy when the machine is in motion. Fig. 3 is a section takenon line X Y of Fig. 1, showing some of the parts in rear elevation. Fig. 4. is the same as Fig. 3, except that some of the parts are shown in different positions.

In the drawings, A A A A A represent the casting which constitutes the body and frame-work of my machine.

B is the die which serves to cut the buttonhole, and is attached to a vertical] y moving rod, B. The the B cuts onto the adjustable block 5 0, this block being held in, place by the screw 0 and adjusted vertically by the screw 0 Fig. 1. The bar B is operated by a crank, B on the crank-disk B", the action being communicated by the link 13 and pin 13, which projects 40 from the sleeve 13, which is firmly clamped to the bar B by the screw b, as shown in Fig. 1. The crank-disk B is attached to the main shaft B" B", which receives its motion from the driving-wheel B whenever the said driving-wheel 5 is moved forward, so that the parts of the clutch device engage one with another, as will be hereinafter explained? D is a disk rigidly attached to the drivingshaft B B and has upon its face a cylindrical 5o portion, D, and a face-cam, D, also a socket,

(shown atD Figs.3 and 4.) This socket at ll) serves as a recess for the enteringofthe upper end of the locking-pin E, said pin E being shown in position in Figs. 1 and 3, that being the position it occupies while locking the operative part of the machine. The locking-pin E slides verticallyin a housing,EE (Shown in elevation in Fig. 1.) This lockingnn E is forced upward by means of a spring, 0, the lower end of which rests upon a part, E, ofthe 6o hou-ing E, while the upperend reacts against 7 a collar, 0, which is made fast to the lockingpin E by means of a set-serew,c the tendency of the spring being to throw thclocking-pin E upward.

The housing E E wh ch carries thelocking-pin E, has a shank, F, extending laterally through the boss A and into a hole made at A" in the frame of the machine, as shown in Fig. 1. This construction allows of a horizon- 7o tal movement of the housing E and all of its attached parts, the movement being parallel to the shaft B B. This movement is influenced in one directi0nthat is, toward the front of the maehine-by means of the spring F, one end of the spring F resting against the fixed boss A, while the other end reacts against a collar, F which is fastened to shank F'hy means of a set-screw, F so that the tendency of the spring is to draw the housing Etoward 8c the front of the machine.

The collar F is tlat on it sunder side and tests and slides upon the fiat surface of the projection A (see Fig. 1,) so that neither the shank F nor the housing E E can turn about the axis of the shank F. The upper and rearend, E of the housing E E terminatesin a clutch-fork, E the bifurcations of which are in a groove formed in that part of the clutch marked I-I, Fig. 1, so that any longitudinal movement of the hous- 9c ing E E causes a correspoinling'longitudinal movement of the clutch H and the drivingwheel B on the shaft B 15".

1), Figs. 1,3, and 4-, is a stop or buttress attached to the cylinder D, and serves to engage 91 with the stop H on the part of the clutch H, so that whenever the part H is moved forward to the position shown in Fig. 2 then the stops H and D will engage one with the other, and thus the motion of the driving-wheel B will It be communicated to the operating part of the machine.

The locking-pin E has a fillet, E on it, (see Figs.3 and 4,) the uppersuriace of which serves as a shoulder for the arms L L to catch upon. (See Fig.3.) These arms L L are hinged at the points L L to an upright bar, L L, the said bar L L being connected to a foot-lever, by which it is operated by the user of the machine. The upper partof this bar'L L is made hollow, so that it may-slide up and down on the lower end of the lock-pin E.

The pins K K, Figs. 1, 3, and 4, are stationary, as showmand serve to throw out the arms L L against the pressure of the springs L L, so as to disengage them from the fillet E on the lock-pin E when the said lock-pin E has been drawn down by them sufficiently far to clear it from the socket in the cam-disk D. As soon as this lock-pin E is withdrawn then the spring F, Fig. 1, will draw the housing E E and with itthelock-pin E,forward tothe position indicated in Fig. 2. This motion of the housing E E will, acting through the fork E draw the clutch [I forward, so that the stops H and D" will engage with each other and start up the machine. This motion of the machine will continue until the shaft B B has nearly made one revolution. \Vhen the face-cam D comes in contact with the 1ock-pin E (said lockpin E having in the meantimemoved vertically upward.) it forces it, together with the housing E E backward, thus causing the clutch-stop H to disengage with the stop D, and just at the time of this disengagement the pin E springs arrangement of the parts already describednamely,'the arms L L, their springs L L, and the upright bar L L, which, in connection with the foot-lever, serve to draw down the lock-pin E, since by this arrangement it is impossible t'or the operator to hold the lock pin E away from the notch in the cam, the operator being enabled to withdraw the pin from the catch, but not to retain it, as the stationary pins K K automatically throw off the arms L L, and thus release the lock-pin E at once, it being impossible for the operator to hold the lock-pin down.

I claim- In a button-hole-cuiting machine, the com bination of the clutch device and the lock-pin E with the lock-pin-withdrawing device, consisting of the arms L L, springs L L, bar L L, and stationary throw-otf pins K K, all operating together substantially as described, and for the purpose set forth.

CHARLES E. LANGMAID.

Witnesses:

HELEN M. FEEGAN, FRANK G. PARKER. 

